fix: add a11y configuration for checking through control and input component

[tanhauhau]

Fixes #6469

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• [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• [x] Prefix your PR title with [feat], [fix], [chore], or [docs].
• [x] This message body should clearly illustrate what problems it solves.
• [x] Ideally, include a test that fails without this PR but passes with it.

Tests

• [x] Run the tests with npm test and lint the project with npm run lint

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[dummdidumm]

Not merging for v3 or v4 to give us room to think about the whole thing more deeply for v5

[ByteAtATime]

Hey, is there a reason this PR isn't merged yet? I feel that it would be very useful in situations where inputs need custom input validation or functionality.